https://towardsdatascience.com/getting-started-with-r-programming-2f15e9256c9
https://theconversation.com/que-el-dia-tenga-24-horas-y-no-mas-ni-menos-lo-decidieron-los-antiguos-egipcios-209435
https://www.iso.org/files/live/sites/isoorg/files/store/en/PUB100456.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20058en.pdf